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Note 15 - Other Income (Expense), Net (Details Textual) - USD ($) $ in Millions |  |  | 3 Months Ended
--- | --- | --- | ---
Jan. 30, 2026 | Jan. 01, 2026 | Mar. 31, 2026 | Mar. 31, 2025
Restructuring Charges |  |  | $ 6 | $ 2
Gain (Loss) on Disposition of Stock in Subsidiary or Equity Method Investee | $ (8) |  | (8) |
Allison Transmission Holdings, Inc. [Member] | Discontinued Operations, Disposed of by Sale [Member] | Off-highway Business [Member] |  |  |  |
Transition Services Agreement, Period (Month) |  | 24 months |  |
Electric Vehicle Programs [Member] |  |  |  |
Restructuring Charges |  |  | $ 56 |

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